B1.4 Photosynthesis

    Cards (77)

    • How do most plants obtain their food?
      They make their own food by photosynthesis
    • What do plants use the food they produce for?
      To grow and increase their biomass
    • What do plants provide for humans?
      Food, building materials, paper, and medicines
    • What is photosynthesis?
      Process by which plants make their food
    • What are the raw materials needed for photosynthesis?
      Carbon dioxide and water
    • How does carbon dioxide enter the plant?
      It diffuses through stomata from the air
    • How does water enter the plant?
      It enters the roots through root hair cells by osmosis
    • What do carbon dioxide and water react to produce in photosynthesis?
      Glucose and oxygen
    • What is the word equation for photosynthesis?
      Carbon dioxide + water → glucose + oxygen
    • What is the symbol equation for photosynthesis?
      6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂
    • Where does photosynthesis mainly occur in plants?
      In the leaves and green stems
    • Why are leaves and stems green?
      They contain chlorophyll in their chloroplasts
    • What role does light play in photosynthesis?
      It transfers energy to chlorophyll for reactions
    • What are the two main stages of photosynthesis?
      Light dependent and light independent stages
    • What happens in Stage 1 of photosynthesis?
      Light energy splits water into oxygen and hydrogen ions
    • What happens in Stage 2 of photosynthesis?
      Carbon dioxide combines with hydrogen ions to make glucose
    • What type of reaction is photosynthesis?
      It is an endothermic reaction
    • What does the prefix "photo" in biological terms refer to?
      Using light to make a change
    • What is the function of starch in plants?
      It provides a store of energy
    • What happens to glucose that is not used immediately?
      It is converted to starch for storage
    • What other substances can plants make from glucose?
      Proteins, cellulose, and fats
    • What is fructose made from?
      Two glucose molecules joined together
    • What is sucrose commonly known as?
      Table sugar
    • Why do plants need to destarch before testing for starch?
      To ensure no starch is present in leaves
    • How can you test for starch in a leaf?
      Use iodine solution to check for blue-black color
    • Why is chlorophyll necessary for photosynthesis?
      It absorbs light energy needed for reactions
    • What happens to the area of a leaf covered by black card during a starch test?
      It turns yellow-brown, indicating no starch
    • How can you prove that light is needed for photosynthesis?
      Cover part of a leaf and test for starch
    • How can you prove that carbon dioxide is needed for photosynthesis?
      Use soda lime to absorb carbon dioxide
    • How can you prove that oxygen is produced during photosynthesis?
      Collect gas from an aquatic plant and test
    • What factors affect the rate of photosynthesis?
      Light intensity, carbon dioxide, and temperature
    • What are limiting factors in photosynthesis?
      Conditions that restrict the rate of photosynthesis
    • How do you calculate the rate of photosynthesis?
      Rate = amount of product / time
    • If it takes 2 minutes to produce 1 cm³ of oxygen, what is the rate of photosynthesis?
      0.5 cm³ per minute
    • How does light intensity affect photosynthesis?
      Higher light intensity increases the rate of photosynthesis
    • What happens to photosynthesis at very low light levels?
      Photosynthesis is limited or stops
    • What is the measure of how much photosynthesis occurs in a given time called?
      Rate of photosynthesis
    • How is the rate of photosynthesis calculated?
      Rate = amount of photosynthesis / time
    • What are common units for measuring the rate of photosynthesis?
      per second, per minute, per hour
    • If it took 2 minutes for Elodea to produce 1 cm of oxygen at 2500 lux, what is the rate of photosynthesis?
      0.5 cm per minute